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.\" ========================================================================
.\"
.IX Title "CMS_ADD1_RECIPIENT_CERT 3"
.TH CMS_ADD1_RECIPIENT_CERT 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CMS_add1_recipient_cert, CMS_add0_recipient_key \- add recipients to a CMS enveloped data structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
\&                                            X509 *recip, unsigned int flags);
\&
\& CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
\&                                           unsigned char *key, size_t keylen,
\&                                           unsigned char *id, size_t idlen,
\&                                           ASN1_GENERALIZEDTIME *date,
\&                                           ASN1_OBJECT *otherTypeId,
\&                                           ASN1_TYPE *otherType);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fICMS_add1_recipient_cert()\fR adds recipient \fBrecip\fR to CMS_ContentInfo enveloped
data structure \fBcms\fR as a KeyTransRecipientInfo structure.
.PP
\&\fICMS_add0_recipient_key()\fR adds symmetric key \fBkey\fR of length \fBkeylen\fR using
wrapping algorithm \fBnid\fR, identifier \fBid\fR of length \fBidlen\fR and optional
values \fBdate\fR, \fBotherTypeId\fR and \fBotherType\fR to CMS_ContentInfo enveloped
data structure \fBcms\fR as a KEKRecipientInfo structure.
.PP
The CMS_ContentInfo structure should be obtained from an initial call to
\&\fICMS_encrypt()\fR with the flag \fB\s-1CMS_PARTIAL\s0\fR set.
.SH "NOTES"
.IX Header "NOTES"
The main purpose of this function is to provide finer control over a \s-1CMS\s0
enveloped data structure where the simpler \fICMS_encrypt()\fR function defaults are
not appropriate. For example if one or more KEKRecipientInfo structures
need to be added. New attributes can also be added using the returned
CMS_RecipientInfo structure and the \s-1CMS\s0 attribute utility functions.
.PP
OpenSSL will by default identify recipient certificates using issuer name
and serial number. If \fB\s-1CMS_USE_KEYID\s0\fR is set it will use the subject key
identifier value instead. An error occurs if all recipient certificates do not
have a subject key identifier extension.
.PP
Currently only \s-1AES\s0 based key wrapping algorithms are supported for \fBnid\fR,
specifically: NID_id_aes128_wrap, NID_id_aes192_wrap and NID_id_aes256_wrap.
If \fBnid\fR is set to \fBNID_undef\fR then an \s-1AES\s0 wrap algorithm will be used
consistent with \fBkeylen\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fICMS_add1_recipient_cert()\fR and \fICMS_add0_recipient_key()\fR return an internal
pointer to the CMS_RecipientInfo structure just added or \s-1NULL\s0 if an error
occurs.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3), \fICMS_decrypt\fR\|(3),
\&\fICMS_final\fR\|(3),
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.